Permissible and Impermissible actions in Ihraam

Q: In the state of ihraam, if a person indulges in sexual relations, then what is the condition of his hajj? In regard to this mas’alah, can you please explain in detail the laws pertaining to a mufrid, mutamatti and qaarin?

Q: In the state of ihraam, is it permissible for one to discuss issues relating to sexual intercourse with his wife?

Q: What is the Shar’ee ruling if a man covers his feet during ihraam (e.g. through wearing socks or shoes)?

Q: What type of sandal or footwear should a person wear in the state of ihraam?